This article will attempt to answer the question, “Who were the 'sons of God' and the 'daughters of men' of Genesis Chapter 6:1-4?" Bible passages will be from the Holman Christian Standard Bible unless otherwise noted.
Gen. 6:2 bənê hāʼĕlōhîm — the sons of Elohim
Job 1:6, 2:1 bənê hāʼĕlōhîm — the sons of Elohim
Job 38:7 bənê ĕlōhîm — (lacking the definite article) sons of godly beings
1. Fallen angels
2. "Godly" descendants of Seth.
3. Kings or rulers described as "gods."
4. Humans possessed by demonic fallen angels.
The main objection to this happens to be based on Jesus’ statement that, like the angels, there won’t be marriage or marrying in heaven in the resurrection. That does not say that angels were never capable of marrying, or that they were not capable of sexual unions with humans. In every event with angels in the Bible, they appear in physical bodies in the form of men, and in Gen. 18 even ate food.
I believe the case for the “sons of God” being fallen angels is the strongest case for their identity.